Improvement in door-bells



J. P. CONNELL.

Dnor-Bells N0,149,375 Patented Apru 7,1874.

/mm ONHT. f v f f w@ PATENT OFFICE.

JOHN P. CONNELL, OF KENSINGTON, CONNECTICUT.

IMPROVEMENT IN DOOR-BELLS.

Specification formingpart of Letters Patent No. 149,375, dated April 7, 1874; application filed August 12, 1873.

To all whom 'it may concern:

Be it known that I, J oHN P. GoNNnLL, of Kensington, in the county ot Hartford and State of Connecticut, have invented certain new and useful Improvements in Door-Bells, of which the following is a specification, reference being had to the accompanying drawings, in which-'f ,with the bell and camplate properly affixed.

Fig. 7 is an underneath view ofthe parts shown in Fig. 6.

This bell is intended as an attachment for shop and ofce doors, to be sounded by the opening of the door, so as to give notice of the entrance of a person.

The parts in which the invention consistsA will be particularly specified at the end of this specification.

The letter a indicates the base-plate of the bell, and b the sounding-shell, supported from .the base-plate by a centralpost or pillar in the common way. The letter c indicates the hammer, pivoted on the pin d, and having its stroke given by the spring d. The hammerarm has a V-shaped projection, c. The letter e indicates the. trippingflever, which actuates the hammer. It has two horns, el el, partially embracing the V-shaped projection of the hammer. It is hung on the pivot-pin f, and vibrates upon it. The outer end of the trippinglever has a rising` arm, e2, on which is the cam stroke receiver e3. The letter g indicates a cam-plate, to be fastened to the door` h, whilev the bell itself` is fastened upon the jamb o, though the relative positions of the bell and the cam-plate may be reversed, if desired. Upon the end of the cam-plate is the cam g, which operates and actuates the tripping-lever. -When the door is shut, the cam g lies quiescent under and back of the cam-stroke receiver c3. When the door is opened, (see Fig. 6,) the cam g raises the outer end ot' the tripping-lever, so that the inner end of the tripping-lever raises the hammer for a stroke. At the proper point, and before the then impinging horn ofthe trippinglever slips by the apex of the V-shaped projection of the hammer-arm, the cam g' slips by the cam-stroke receiver e, and allows the hammer to trip and sound the bell. Then the door shuts, the cam f )asses back over the to J of the cam-stroke .l l

receiver, actuating' the tripping-lever in the opposite direction, and againsounding the bell.

I claim as my invention The combination of the following parts designed to be fastened to the door, to wit, the baseplate a, spring d, hammer c, provided with the V-shaped projection c', tripping-lever c projecting from the base-plate, and bearing the strokereceiver c, with the following parts designed to be fastened to the doorjamb, to wit, the cam-plate g, bearing the cam g, the whole constructed, arranged, and designed for operation and use substantially as set forth.

JOHN P. CONNELL.

Vitnesses NVM. E. SrMoNDs, JOHN POLLITT. 

